Appabatus fob making plate glass



F. GELSTHARP APPARATUS FOR MAKING PLATE GLASS Original Filed May 18.1925 3 Sheets-sheet l INVENTOR F. GELSTHARP APPARATUS FOR MAKINGPLATEGLASS 3 Sheets-Sheet 2 Original Filed May 18. 1925 IN VENTOR WJfT... A i l l l l III F 1 Jan. 17, 1928.

F. 'GELSTHARP APPARATUS FOR MAKING PLATE GLASS Original Filed May 18.1925 3 Sheets-Sheet I5 Reissued Jan. 17, 1928.

UNITED STATES PATENT OFFICE.

rnnnnnrcx ennsrnanr, or 'ranunrmr, rnnnsnvmra, ASSIGNOR *ro rrrrs- BURGHPLATE GLASS a eonronarron or. rn'mrsrnvanu.

APPARATUS FOR IAKIHG PLATE GLASS.

Original No. 1,615,834, dated February 1, 1921, Serial Io. $0,950, am my18, 1925. a lication mreissue fled November 25, 1927. Serial No.235,716.

The invention relates to apparatus for producing a continuous sheet orribbon continuously from a bod of molten glass. It has for its, primaryject the provision of improved means for accomplishing the function asabove set forth and for producing glass of superior quality, which isperfectly,

Fig. .5 is a section on the VV of Fig. 2.

And Fig. 6 is a vertical sectionthrough a modification of theFig. 1construction.

1 Referring to the drawings, '1 is the end ofa melting tank, preferablyof the well-known regenerator type having at its end the forehearth orkiln 2 with a pair of cut 06 gates 3 and4, arranged as indicatedinFig. 1. These gates are supported from above by means of the chains 5and[6 carried by suitable overhead lifting means, not shown, the gate 3being of refractory material, such as clay, and the gate 4 being ofmetal provided with-means whereby it may be cooled by a circulation ofwater. The 11 per side of the iorehearth 2 18 open and in t s open spaceis mounted a pair of forming or sizing rolls 7 and 8, such rolls a beingjournaled at their ends in the brldge 9, such bridge being movable intoand out not shown, to which the bridgeis connected 1 by means of thechains 10. j p 7 Onthe outer side of the roll 8 1sa table or platen 11,preferably water cooled by means of a circulation therethrough. Theglass sheet 12 passes over the table 11 and onto the apron 13, suchapron bei pmvided with a series of watercooled ven rolls 14 to 24. Theapron rests at this left of position by means of an overhead crane,

tensio right hand end is pivoted for swinging movement around the axle26 of the roll 24,

so thatwhen desired, the apron may be swung up-to a vertical positionfrom the horizontal position shown. Mounted above the apron is a.portable cover 27 supported from above by means of the chain 28preferably carried upon a suitable crane whereby the cover may be movedlaterally after it 15 lifted from the position shown. A plurality ofburner pipes 29, 30 and 31 are ample ed for maintainlng the temperatureof the glass in its passage to the leer. Beneath the apron 1s a portablebottom member 32 supported upon thetruck 33 mounted on the track 34. Themember 32 assists in maintaining temperature conditions constant in thespace surrounding the glass thereabove. The truck permits the member 32to be removed to one side when the apron is removed in order to givemore ready access tothe front end of the furnace for replacements orrepairs.

From the apron,the glass passes into the end of the leer 35, which is ofthe roller type employing the series of rolls 36, 37, 38, etc.

The leer rolls are driven by means of a chain 39 passin around suitablesprockets on the ends of t e roll shafts. The and roll 24 of the seriesof apron rolls is driven from the endleer roll 36 by means of a shortchain 40, passing around suitable sprockets on the ends of the two rollsThe other apron rolls are driven by means of the chain 41 passing arounda sprocket on the end of the roll 26 and over' the tops of othersprockets carried by the ends of the apron rolls. -An idler roll 42 isprovided as a takep for maintaining the chain 41 in v The endsof therolls 7 and 8 are set down into theside walls of the forehearth 2, as 1indicated at 43 in Fig. 4, and the triangular ace in'the wall betweenthe rolls is prefer- :bly closed by means of the hollow metal circ'heated froni a burnen pipe 46 leading .in at one end, the gases ofcombustion allowed to discharge through perforations 47 at the otherend. The heating of the member tends to give tla: edge of the sheetwhich on the shafts to which the tumbler shafts 'continuously,

are connected; The ends of the bridge are so ported by the standards 48(Fig. 2 to w ichsuchendsaresecuredbymeanso the bolts 48".

In operation the rolls 7 and 8 are rotated drawing up from the body ofmolten lass the sheet 12' which p over 'the tab e 11 and the apron 13 tothe leer.- Thecontact of the glass with the rolls 7 and a Band with thetable 11 causes it to set-to suchan extent that it will not sag to anysubstanfill (hgl'BO when it p w the apron 13 and from this point on, anyunevenness in the glass is flattened out as the sheet progressesover'therollers and the leer. The glass is annealed in the leer and cut ofi atthe far end thereof, after which it s ground and polished in the usualway on circular tables or in a straight away surfacing operation. Therolls 7 and 8 size the sheet to substantially its final thickness, thesurface formed being relatively smooth as compared with-plate glasscasein the usual way on tables, but uires grindi' and polishing due tothe ii iarring of tli bfi Fig. 6 i ustrates a-modification, whichdiffers from that of Fig. 1 only in that the sheet 12 as formed betweenthe sizing .8 pa directly onto the water cooled rolls 54 of the apron,instead of passing first onto a table or platen, such as thetable 11 inFig. 1. This arrangement me be if the glass sheet as itis formed y therolls 7 and 8 l8 snificiently chilled so that it will "not sag to anysubstantial extent in passing to the end roll of the apron and over thesucceeding rolls of the apron.

What I claim is:

1; In combination,

y and having the rh'ons of their peripheries casing 53 comover therollers of rolls 7 and,

so as to of said ,rolls for carrying away the glass which is formed.

2. In combination, a glass tank containing 'which the ends of the rolsare journaled,

means for supporting the bridge for vertical movement, an a glassreceiving bed extendlaterally from the side of one of said :is forcarrying away the glass wh ch is formed.

3.. In combination, a glass tank contaming a body of molten g1 andhaving a slot in its upper wall, a pair 0 horizontaldriven and cooledsizing rolls seated in and slot,

and constituting a closure therefor and having the lower portions oftheir peripher ies immersed in said body of glass, and a glass receivingbed extendin laterally from the side of one of said re s for earrymgaway the glass which isformed.

4. In combination, a glass tank containing a body of molten glass, andhaving a slot in having the lower portions of their pe'ripherits upperwall, a pair of horizontal vdriven ies immersed in said body of glass,9. bridge in which the ends of the rolls are journaled,

closure means for the spaces between the rolls at the ends thereofcarried by the bri means for supporting. the bridge for .verticalmovement, and a glass receiving extending laterally from the side'of oneof said rolls for carrying away the glass which is formed. 1

- 5. In combination, a glass tank containing a body,o molten lass andopen above a portion. of the bat a pair of horizontal driven sizingrolls above said portion of the bath, at least one of which has itsperiphery immersed in said. body of glass,- means for the rollsso as toprevent'the glass from sticking thereto, and a glass receivin: bed orrunway extending laterall at one si e .of said rolls for carrying away t10 glass which-is formed between the rollsand (lebath, at leastone ofwhich has its. periphery insaid body of glass, means for (prevent theglass from shclnng'thereto, an

away lateral] the 7 s plsn'izirlm thebegigeen the ml 8 and e we u y 7.In combination, a glass tank containing a body of'molten glass and openabove a portion of the bath, a pair of horizontal holmeans for sup-16,856 i x a low imperfoi'ate sizing rolls seated in the rolls, such asto prevent the glass from stickopen portion of the tank with theperipheries ing thereto, means for driving the rolls, and of both rollsextending down intoit-he body 1116211151501 supporting and carryin awaythe l of glass a substantial distance so that in opglass which is sizedbetween the r0 1s and de- 5 motion the space between the rolls lying inVlivered upward thereby. the bath is filled with molten glass, means forcirculating a cooling fluid through the FREDERICK GELSTHARP.

